JP3364426B2 - How to build pillars - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a column using a hollow precast concrete column (hereinafter referred to as hollow PC column) unit in which a column main bar and a beam main bar are assembled in advance.

[0002]

2. Description of the Related Art Conventionally, there is a method disclosed in Japanese Patent Application Laid-Open No. 4-216747 as a method of constructing a column using a formwork for constructing a concrete column. In this pillar construction method, a pillar is constructed using a hollow PC pillar formwork by four steps as shown in FIG.

That is, as shown in FIGS. 12 (a) and 12 (b), the lower end of the column main reinforcement 2 of the floor is connected to the upper end of the column main reinforcement 1 protruding from the floor surface at the column installation position. As shown in FIG. 12 (c), from above the pillar main bar 2
A hollow PC column formwork 3 having a hollow cross section having a hoop line built therein is suspended by being extrapolated to the column main bar 2. As shown in FIG. 12D, the verticality of the hollow PC column form 3 is adjusted on the lower side and supported by the supporter 4. As shown in FIG. 12 (e), the beam rebar cage 5 is assembled on the hollow PC column form 3 with the beam main reinforcement and the beam shear reinforcement, and the beam form 6 is further assembled. And hollow PC pillar formwork 3
And the cast-in-place concrete 7 is placed inside the beam form 6.

However, in the conventional method of constructing a column using the PC column formwork, (a) hoisting the reinforcing rods such as the column main bar 2 and the beam main bar and the hollow PC column formwork 3 from the ground to each construction floor. When it is applied to a high-rise building, the construction height (lifting height) becomes high, so that the time required for lifting becomes long and the construction efficiency becomes poor. (b) Since the length of the column main reinforcement 2 is the height of the first floor, the column main reinforcement 2 and the column main reinforcement 1 must be connected on all floors, and it takes time and effort to construct the column. Requires. (c) Since it is advantageous to bring the main pillar rebar 2 closer to the hoop muscle as much as possible, the hollow PC pillar formwork 3 is moved to the main pillar rebar 2 with the inner wall surface of the hollow PC pillar formwork 3 being close to the main pillar rebar 2. Must be extrapolated to. However, the position of the end of the column main reinforcement 2 of the floor connected to the upper end of the column main reinforcement 1 protruding from the floor is high, and the tip of the column main reinforcement 2 of the floor at the higher position is outside the column main reinforcement 2. In order to extrapolate the hollow PC column form 3 to the above, manual adjustment is required. Therefore, the scaffold 8 for work at high places must be assembled / disassembled for each construction floor, which requires time and expense.
There is a problem such as.

Therefore, there has been proposed a method for constructing a column using a hollow PC column unit having a column-beam main bar tip as shown in FIG. This pillar construction method is performed by the following procedure.

As shown in FIG. 13 (a), the hollow PC column formwork 12 for the first floor in which the column shear reinforcement is embedded is erected on the floor 15 of the above-ground stockyard. Frame 1
On the upper end portion of 2, the beam main bar pre-assembled rebar cage 13 assembled with a plurality of beam main bars and beam shear reinforcing bars is placed. And 2
A plurality of pre-assembled column main bars 14 having a floor height of each floor are inserted into the hollow PC column form 12 through the beam main bar pre-assembled rebar cages 13 in a predetermined arrangement to form a column beam main bar pre-assembled hollow PC. The pillar unit 11 is assembled. In this way, the assembled pillar / beam main bar front assembled hollow PC pillar unit 11 is stored as it is on the floor 15 of the stockyard. As shown in FIGS. 13 (b) to 13 (d), the hollow PC
Column formwork 12, beam main bars, pre-assembled rebar cages 13, and pre-assembled column main bars 1
In the state where 4 are integrated, the column beam main bar front assembly hollow PC column unit 11 is lifted to the N floor, and the lower end of the front assembly column main bar 14 is (N-
1) Connect to the upper end of the column main bar 16 from the floor. Then, the hollow PC pillar formwork 12 in a state where the beam main reinforcement first set rebar cage 13 is placed is brought into contact with the floor surface of the Nth floor. As shown in FIG. 13E, the beam form 17 for N floors is lifted and assembled. As shown in FIG. 13E, concrete 18 is placed inside the hollow PC column form 12 and the beam form 17. As shown in FIG. 13 (f), the hollow PC column formwork 19 for the (N + 1) th floor is extrapolated to the main post 14 of the assembled post. (N + 1) floors of the main beam reinforcement front assembly rebar cage (not shown) and beam form (not shown) are lifted and assembled. Hollow PC pillar formwork 19 for the (N + 1) th floor and (N +
1) Place concrete inside the beam formwork on the floor.

As described above, by using the above-mentioned hollow PC column unit 11 for the main beam / column reinforcement, the hollow PC column unit 11 for the main beam / column main frame is lifted to the hollow PC.
Column formwork 12, beam main bars, pre-assembled rebar cages 13, and pre-assembled column main bars 1
It solves the problem of longer lifting time when lifting 4 individually and the problem of assembling / disassembling scaffolding on each floor. Furthermore, since the length of the pre-assembled column main reinforcement 14 has the height of the second floor, on the (N + 1) th floor, the connection between the front-assembled column main reinforcement 14 and the column main reinforcement 16 can be omitted. The time and labor required for the above connection can be reduced to approximately half.

[0008]

As described above, in the method of constructing a column using the above-mentioned column-column main bar pre-assembled hollow PC column unit 11, the length of the pre-assembled column main bar 14 is the column construction floor and above. Since the floor height for the second floor is the same as that of the second floor, when constructing the pillars of the upper floor, it is sufficient to suspend the hollow PC pillar formwork 19 and the beam main bar front assembly rebar cage for the upper floor. There is an advantage that the construction procedure of the building can be simplified.

However, in that case, considering the working condition of the standing floor of the pillar / beam main bar front assembled hollow PC pillar unit 11 and the entire upper floor thereof, the standing floor (that is, the pillar construction floor).
In the above, while the standing work of the above-mentioned pillar / beam main bar pre-assembled PC pillar unit 11 and the assembling work of the beam formwork 17 are performed, in the upper floor of the pillar construction floor, the hollow PC pillar formwork 1 is used.
The extrapolation work of No. 9 and the work of assembling the beam main bar front braces and the beam formwork for the upper floor are performed. That is, different works are performed on the pillar construction floor and the upper floor.

Normally, when a high-rise building having the same structure on each floor is constructed, the work on each floor is leveled in order to facilitate the planning of the work process. However, the number of workers required for the standing work of the column-column main bar pre-assembled PC column unit 11, the extrapolation work of the hollow PC column formwork 19, and the assembly work of the beam main bar pre-assembled rebar cage for the upper floor, In the above-described construction method of the pillar in which the work is different between the pillar construction floor and the upper floor because the work equipment is different, the work between the pillar construction floor and the upper floor is not leveled. Therefore, there is a problem that the planning of the work process is troublesome and the construction efficiency is deteriorated.

Therefore, an object of the present invention is to level the work on each floor without impairing the advantages of the column-column main bar front-end hollow PC column unit as described in the section of the prior art. The purpose of the present invention is to provide a method for constructing a pillar that facilitates work process planning and has high construction efficiency.

[0012]

In order to achieve the above object, a method of constructing a pillar according to a first aspect of the present invention is such that a pillar of a reinforced concrete structure in which a pillar shear reinforcing bar is buried is formed.
A hollow PC column formwork, a first beam main bar pre-assembled rebar cage mounted on an upper end portion of the first hollow PC column form, preassembled in a predetermined arrangement, and the first beam main bar pre-assembled rebar The first beam main bar tip over the entire length through the cage into the first hollow PC column formwork
With the assembled rebar cage and the first hollow PC pillar formwork, and a plurality of pre-assembled pillar main bars having the height height of the second floor inserted so as to be relatively movable,
The first step of creating a column / beam main bar front set hollow PC column unit, and further creating a second hollow PC column formwork having the same configuration as the first hollow PC column formwork, and the above-mentioned column / beam main bar point Pair hollow P
C pillar unit is lifted and moved, and the lower end part of the above-mentioned pre-assembled column main bar which penetrates the above-mentioned 1st hollow PC column formwork is projected from the construction floor by a predetermined column bar connection length. Second hollow PC column formwork, after the first hollow PC column formwork is lowered together with the first beam main rebar front assembled rebar cage and installed on the construction floor after connecting to the upper end of the The third step of lifting and moving the second pillar to install it on the construction floor by extrapolating it to the second pillar main bar protruding from the construction floor by the length obtained by adding the construction floor height to the connection length of the pillar , Concrete is placed on the above-mentioned column / beam main bar front-end hollow PC column unit and second hollow PC column form to make the first and second hollow PC column forms and the construction floor surface into an integral structure A fourth step is provided, and the first pillar main bar and the second pillar main bar are at least one of two girder directions of the building. It is characterized by being arranged alternately towards.

According to the above construction, the first pillar main bar projecting from the construction floor by a predetermined column reinforcing bar connecting length and the second pillar main bar projecting by a length obtained by adding the working floor height to the column reinforcing bar connecting length. And
They are alternately arranged in at least one of the two girder directions of the building. And, a column-column main bar front-end hollow PC column unit is erected on the upper end portion of the first main column bar. On the other hand, a second hollow PC column form is externally inserted on the second column main bar. In this way, on the construction floor, the above-mentioned pillar beam main bar front set P
The standing work of the C pillar unit and the extrapolation work of the second hollow PC pillar formwork are performed in parallel or sequentially. Therefore, the protruding portion of the pre-assembled column main bar having the floor height of the second floor in the pre-assembled hollow PC post unit to the upper floor is the second post main bar on the upper floor, while the post bar is By making the projecting portion of the second pillar main bar having a length obtained by adding the construction floor height to the connection length to the above upper floor as the first pillar main bar on the above floor, the above-mentioned column beam main bar front assembly hollow PC column unit The column construction work can be leveled on all construction floors without impairing the advantages of the above, and the work process can be easily planned and the construction efficiency can be improved.

According to a second aspect of the present invention, in the method of constructing a column according to the first aspect of the present invention, the column beam main bar front assembled hollow PC column unit produced in the first step is the first hollow PC. A pillar-beam main bar pre-assembled hollow PC pillar unit in which a first beam form is attached to an upper end portion on a side surface of a column form so as to cover a lower side of the first beam main bar pre-assembled rebar cage. The second hollow PC pillar formwork made in is a second hollow PC with a second beam formwork attached to the upper end of the side surface.
It is characterized by being a pillar formwork.

According to the above construction, the beam form is preliminarily attached to the above-mentioned column-beam main bar front assembled hollow PC column unit and second hollow PC column form. Therefore, it is not necessary to assemble the beam forms near the first and second hollow PC column forms on the construction floor, and the construction efficiency of the building is further enhanced.

According to a third aspect of the present invention, in the method of constructing a column according to the first aspect of the present invention, the column beam main bar front assembled hollow PC column unit produced in the first step is the first hollow PC. A plurality of column formwork is installed side by side at a predetermined interval, and the first beam main bar pre-assembled rebar cage is erected on the upper ends of the plurality of first hollow PC column form frames. It is a PC pillar unit.

According to the above construction, when one pillar beam main bar front assembly hollow PC pillar unit is erected on the construction floor, a plurality of first hollow PC pillar formwork are erected at the same time in parallel with the construction floor. Will be installed. In this way, the construction efficiency of the building is further enhanced.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1 and 2 show a work procedure in the method of constructing a pillar according to the present embodiment. Here, in the present embodiment, similar to the column-beam main bar tip assembled hollow PC column unit 11 shown in FIG. 13, a first hollow PC column formwork that is a square tubular body in which rectangular column shear reinforcement bars are embedded. 22 and the first beam main bar pre-assembled rebar cage 23 placed on the upper end of the hollow PC column formwork 22, and a plurality of pre-assembled columns of two floors in height which are pre-assembled in a predetermined arrangement. The column-beam main reinforcement tip assembled hollow PC pillar unit 21 assembled with the main reinforcement 24 is used. The first hollow P
The C-column form 22 does not necessarily have to be a rectangular cylinder, and may be another cylinder such as a cylinder.

The above-mentioned column-beam main bar front assembly hollow PC column unit 21
The method of constructing a pillar using is performed by the following procedure.

First, as shown in FIG. 1 (a), the first hollow PC pillar formwork 22 for the lower first floor is erected on the floor surface 25 of the stockyard above the ground. Next, the first beam main reinforcing bar front assembly rebar cage 23
However, the panel zone portion, which is an intersection with the pre-assembled column main reinforcement 24, is positioned on the upper end surface of the first hollow PC column form 22, and is horizontally placed on the first hollow PC column form 22. Next, the pre-assembled column main bars 24 attached to the hanging jig 26 and arranged along the inner wall surface of the first hollow PC column formwork 22 are
The C-column formwork 22 is inserted along the inner wall surface of the C-column formwork 22 to assemble the column-beam main reinforcement tip assembled hollow PC column unit 21. Also, a second hollow PC having the same structure as the first hollow PC pillar formwork 22.
A pillar form 36 is erected on the floor surface 25 of the stockyard.
Then, the column-beam main reinforcement tip assembled hollow PC column unit 21 and the second hollow PC column form 36 assembled as described above are stored as they are on the stockyard floor surface 25.
In addition, in the column beam main bar front assembled hollow PC column unit 21,
The first hollow PC column formwork 22 and the first beam main reinforcing bar pre-assembled rebar cage 23 are movable in the vertical direction with respect to the pre-assembled column main reinforcing bar 24. Further, the stockyard floor surface 25 may be set to a place other than the ground. It should be noted that all of the pre-assembled column main bars 24 may be inserted all at once into the first hollow PC column form 22 as described above, or the upper ends of all the pre-assembled column main bars 24 may be inserted individually. The portion may be held by the hanging jig 26.

As shown in FIG. 1 (b), from the floor surface of the N-th floor where the pillar is erected, the pre-assembly of the column-beam main bar pre-assembled PC post unit 21 which is erected on the (N-1) th floor. The upper floor portion of the pillar main bar 24 projects. Hereinafter, the projecting portion of the column-column main bar pre-assembled PC column unit 21 erected on the (N-1) th floor will be referred to as a long column main bar 27. Further, the tip portion of the front-end column main bar 24 of the column-beam main bar front-column PC column unit 21 which is erected on the (N-2) th floor is projected. Hereinafter, the projecting portion of the column-beam main bar pre-assembled PC column unit 21 erected on the (N-2) th floor will be referred to as a short column main bar 28. Here, the long column main reinforcements 27 and the short column main reinforcements 28 are alternately arranged in at least one of the two girder directions of the building to be constructed, and are approximately half and half. still,
When the Nth floor is the lowest floor, a column main bar having a predetermined column main bar connection length is erected in advance as the short column main bar 28 on the floor surface of the lowest floor. Similarly, a column main bar having a length obtained by adding a floor height for one floor to the column main bar connection length is erected in advance as the long column main bar 27.

As described above, the column in which the first hollow PC column formwork 22, the first beam main bar pre-assembled rebar cage 23 and the pre-assembled column main bar 24 are integrally stored on the stockyard floor surface 25 as described above. The beam main bar tip assembly hollow PC column unit 21 is shown in Fig. 1 (c).
-As shown in (d), it is hoisted by the crane 29 and lifted to the Nth floor. Here, the pre-assembled column main reinforcement 24 is hoisted via the hoisting jig 26, while the first hollow PC
The column formwork 22 and the first beam main reinforcing bar pre-assembled rebar cage 23 are hoisted via the hanging jig 30 and the hanging wire ropes 31a and 31b. In that case, the hanging wire for the hanging jig 26 is used. The length of the rope 32 and the length of the hanging wire rope 33 for the hanging jig 30 are the same as those of the first hollow PC pillar formwork 22 and the first hollow PC pillar formwork 22.
The first hollow PC column formwork 22 and the first beam main bar pre-assembled rebar cage 23 slide upward with respect to the pre-assembled column main bar 24 while the beam main bar pre-assembled rebar basket 23 and the pre-assembled column main bar 24 are suspended. Then, the lower end 34 of the main post 24 of the pillar assembly is the first hollow PC.
It is set so as to project from the lower end of the column form 22 by the amount of the joining work.

Then, the lower end (protruding by the above-mentioned joining work allowance) of the pre-assembled column main bar 24 in the column beam main bar pre-assembled hollow PC column unit 21 hoisted to the N-th floor by the crane 29 is located on the N-th floor. Short column main bar 2 protruding from the floor
It is joined to the upper end of 8 by welding or the like. After that, the suspension hook of the crane 29 is further lowered, and the first hollow P
The C-column formwork 22 descends along the first-column main reinforcing bar 24 until it comes into contact with the construction floor surface 35 with the first beam main reinforcing bar front-reinforcing bar cage 23 placed thereon. Then, the hanging jig 26 is removed,
The state shown in FIG. 1 (c)-(f) is obtained. In addition, Fig. 1 (c)-(c)
As shown in, the second hollow PC pillar formwork 36 stored on the floor surface 25 of the stockyard is lifted by the crane 29. Then, as shown in FIGS. 1 (c)-(e), it is extrapolated to the long column main bar 27. Hereinafter, the above-mentioned work is performed in parallel with respect to all the long column main bars 27 and the short column main bars 28.

Next, as shown in FIGS. 2 (d)-(a), (c), and (e), the first of the above-mentioned column / beam main bar front assembled hollow PC column unit 21 is first.
The second beam main reinforcement point assembly rebar cage 37 formed in the same manner as the beam main reinforcement point assembly rebar cage 23 is inserted into the long column form 27 to which the second hollow PC column form 36 is externally inserted, and the second hollow It is placed on the PC pillar form 36. And each of the second beam main bar front set rebar cage 3
Hollow PC column unit 2 which is adjacent to both ends of 7
The tip of the first first beam main reinforcing bar front assembly rebar cage 23 is connected by welding, pressure welding, mechanical rebar joint, lap joint, or the like.

Then, as shown in FIG. 2 (e), the first
Beam main bar front set rebar cage 23 and second beam main bar front set rebar basket 37
A beam form 38 is formed along the above, and concrete 39 is placed inside the first hollow PC column form 22, the second hollow PC column form 36, and the beam form 38. In this way, N
The columns and beams on the floor and the floor on the (N + 1) th floor are constructed.

Thereafter, returning to FIG. 1 (b), the projecting portion of the pre-assembled column main bar 24 of the column beam main bar pre-assembled PC column unit 21 erected on the N-th floor to the (N + 1) th floor is a new long column. While considering it as the main bar, the projecting portion of the long column main bar 27 to the (N + 1) th floor is regarded as a new short column main bar, and the columns and beams of the (N + 1) th floor and (N
+2) Build the floor on the floor.

As described above, in the column / beam main rebar first set hollow PC post unit used in this embodiment, the central portion of the first beam main rebar front set rebar cage 23 is located at the upper end surface of the first hollow PC post form 22. However, the present invention is not limited to the column-beam main bar tip assembled hollow PC column unit 21 having the configuration mounted on.

For example, FIG. 3 shows a first hollow PC beam form 42.
Is a column beam main bar front set hollow PC column unit 41 in which two first beam main bar front set rebar cages 43, 44 extend at an angle of 90 degrees from the upper end surface of the above. In addition, FIG. 4 is a pillar-beam main bar pre-assembled hollow PC column unit in which the intersection of two first beam main bar pre-assembled rebar cages 46, 47 orthogonal to each other is placed on the upper end surface of the first hollow PC column main bar 48. 45. In addition, FIG. 5 has the same configuration as the column beam main bar front assembled hollow PC column unit 45.
The first of the two pillars and beams, the main bar and the front hollow PC pillar units 52 and 53
It is a column beam main bar front set hollow PC column unit 51 in which the tips of the beam main bar front set rebar cages 54, 55 are connected to each other. In addition, in FIG. 5, two column beam main reinforcement front assembled hollow PC column units 52, 5
Although 3 are connected, it is possible to connect 3 or more column-beam main bar front assembled hollow PC column units. Further, although not particularly shown, in order to dispose the first beam main reinforcing bar front assembled rebar cage along the outer wall of the building, the column beam main reinforcing bar front assembled hollow PC pillar unit 4
It does not matter even if it is a deformed body in which unnecessary unnecessary first beam main bar front braided cages are removed from 5,51.

FIG. 6 shows a case where a pillar is constructed by using the above-mentioned column / beam main bar pre-assembled hollow PC column units 41, 45, 51 and their deformed bodies.
A plan view of the pillar construction floor in a state (the state shown in FIG. 1 (c)) in which the standing of 1, 45, 51, etc. and the extrapolation of the second hollow PC column form 36 to the long column main bar 27 have been completed. is there. In FIG.
Inside the closed curve f is the column-beam main bar pre-assembled hollow PC column unit 41, inside the closed curves g and h is the column-beam main bar pre-assembled hollow PC column unit 45 and its modification, and inside the closed curve i, j, k is the column beam. It is a main bar front set hollow PC pillar unit 51 and its deformation body.

FIG. 7 is a sectional view taken along the line AA in FIG. 8 is a cross-sectional view taken along the line BB in FIG. 9 is a sectional view taken along the line CC in FIG. 10 is a sectional view taken along the line DD in FIG. Note that, in FIG. 6, for the sake of explanation, the column-beam main bar pre-assembly hollow PC column unit 45 and the column-beam main bar pre-assembly hollow P
Two types of column beam main rebar first set hollow PC column units together with the C column unit 51 are mixed, but normally one of the column beam main rebar first set hollow PC column units and its deformed body are arranged. .

As can be seen from FIGS. 6 to 10, according to the present embodiment, in the N-th floor, the standing work of the column-beam main bar pre-assembled PC column units 41, 45, 51 and the first column main bar 27 are performed. (2) The extrapolation work of the hollow PC column form 36 is performed in parallel or sequentially. That is, as described above, the long pillar main bar 2
Since 7 and the short column main bars 28 are arranged in approximately half, the work of the Nth floor and the work of the (N + 1) th floor in the construction of the conventional column shown in FIG. It will be done sequentially. This also applies to other floors. Therefore, according to this embodiment, the same work is performed on each construction floor.

As described above, in the present embodiment, (1) the first hollow PC is placed on the floor surface 25 of the stockyard.
The column formwork 22 is erected, and the first beam main bar pre-assembled rebar cage 23 is placed horizontally on the first hollow PC column form frame 22 and penetrates the first beam main bar pre-assembled rebar basket 23 from above. Then, the pre-assembled column main reinforcement 24 having the second floor height is inserted into the first hollow PC column form 22 to assemble and store the column beam main reinforcement pre-assembled hollow PC column unit 21. In addition, the second hollow PC pillar formwork 36 having the same structure as the first hollow PC pillar formwork 22 is attached to the floor 2 of the stockyard.
5 Stand up and store. (2) The above-mentioned column-beam main reinforcement pre-assembled hollow PC column unit 21 is lifted to the Nth floor, and the lower end of the front-assembly main column reinforcement 24 is projected from the construction floor surface 35 alternately with the long-column main reinforcement 27 at approximately a half ratio. It is connected to the upper end of the short column main bar 28 which is connected. And the 1st hollow PC pillar formwork 2 in the state where the 1st beam main reinforcement front set rebar cage 23 was mounted.
2 is installed on the construction floor surface 35. (3) The second hollow PC column form 36 is lifted up to the Nth floor and extrapolated to the long column main bar 27 protruding from the construction floor 35. (4) The second beam main reinforcing bar pre-assembled rebar cage 37 is lifted up and the long column main bar 27 is penetrated to be placed on the second hollow PC column form 36. Both ends of are connected to the tips of the adjacent first beam main bar front braces 23. (5) Assemble the beam form 38 along the above-mentioned first beam main reinforcing bar front assembly reinforcing bar cage 23 and second beam main reinforcing bar front assembly reinforcing bar cage 37. still,
It is also possible to switch the work procedure of (4) and (5). (6) Concrete 39 is placed inside the first hollow PC column form 22, the second hollow PC column form 36, and the beam form 38. (7) In the following, the protruding portion of the pre-assembled column main reinforcement 24 to the (N + 1) th floor of the above-mentioned column beam main reinforcement pre-assembled PC column unit 21 is regarded as a new long column main reinforcement, while it extends to the (N + 1) th floor of the long pillar main reinforcement 27. The protruding part of is regarded as a new short column main muscle, and (1) to (8) are repeated. To build columns and beams.

Therefore, in each construction floor, the work of standing up the above-mentioned post-column main bar pre-assembled PC column unit 21 and the long post main bar 2
The outer insertion work of the second hollow PC pillar formwork 36 and the placement work of the second beam main reinforcing bar front assembled rebar cage 37 for 7 are performed in parallel. That is, according to the present embodiment, the work of constructing columns and beams on each construction floor can be leveled, so that the work process can be easily planned and the construction efficiency can be improved.

Incidentally, in the above-mentioned embodiment, as shown in FIGS. 6 to 9, the above-mentioned column / beam main reinforcement front assembled PC column unit 4 is used.
1,45,51 are arranged in rows. However, the present invention is not limited to this, and for example, FIG.
As shown in FIG. 7, the above-mentioned main post-column main PC column units may be arranged in a staggered manner. The point is that the above-mentioned pillar-beam main reinforcement point assembly P
It is only necessary that the C pillar units and the second hollow PC pillar forms 36 be alternately arranged in at least one of the two girder directions of the building so as to be approximately half.

In addition, in the above-mentioned embodiment, the above-mentioned hollow beam main bar post assembly 21 of the main post of the beam and column is erected, and the second hollow PC post form 36 is externally inserted to the main beam 27 of the long beam. After placing the assembled rebar cage 37 on the second hollow PC pillar formwork 36 and connecting it to the first beam main bar pre-assembled bar cage 23, along the first and second beam main bar pre-assembled rebar cages 23, 37 The beam form 38 is assembled. However, it is also possible to previously incorporate the beam formwork at the intersection of the hollow PC column formwork 22 and the beam main reinforcement formwork rebar cage 23 in the column-beam main reinforcement front assembly hollow PC column unit 21. In the formation of such a column-beam main bar front assembled hollow PC column unit, one end side of the beam form is attached to the upper ends of both side faces of the first hollow PC beam form installed upright on the floor surface of the stockyard. After doing so, the first beam main bar front bracing bar cage is placed on the beam form, and the first hollow PC
This is done by inserting the pre-assembled column main bars into the column formwork. Similarly, one end side of the beam form may be attached in advance to the upper end portions on both side faces of the second hollow PC beam form frame externally inserted to the long beam main reinforcement 27.

[0036]

As is apparent from the above, in the method of constructing a pillar according to the first aspect of the present invention, in the first step, the first hollow PC pillar formwork, the first beam main bar front bracing bar and the second floor In the second step, in the second step, the above-mentioned pillar beam is created by creating a pillar-beam main bar pre-assembled hollow PC pillar unit with a plurality of front-assembled pillar main bars having a floor height length. Main bar tip assembly hollow PC
After lifting and moving the pillar unit and connecting the above-mentioned pre-assembled pillar main bar to the first pillar main bar projecting from the construction floor surface by a predetermined column bar connecting length, lower the first hollow PC pillar formwork. It is installed on the floor of the construction floor, and in the third step, the second hollow PC pillar formwork is hoisted and moved to project from the construction floor surface by the length obtained by adding the construction floor height to the column reinforcement connection length. It is installed on the floor of the above construction floor by extrapolating to the main pillar of the second pillar
In the fourth step, concrete is placed in the above-mentioned column beam main bar front-end hollow PC column unit and second hollow PC column form to integrally structure the first and second hollow PC column forms and the construction floor surface. To At that time, since the first pillar main bars and the second pillar main bars are alternately arranged in at least one of the two girder directions of the building so as to be approximately half and half, on the construction floor, It is possible to perform the standing work of the column-column main-bar pre-assembled PC column unit and the extrapolation work of the second hollow PC column formwork in parallel. Therefore, the above-mentioned column-beam main bar tip assembly P
The projecting part to the upper floor of the pre-assembled pillar main bar having the floor height length of the second floor in the C pillar unit is used as the second pillar main bar on the upper floor, while the construction floor height is added to the column bar connection length. Length of second
By making the projecting portion of the pillar main bar to the upper floor the first pillar main bar on the upper floor, the pillar construction work on all construction floors can be performed without impairing the advantages of the above-mentioned pillar beam main bar pre-assembled PC column unit. Leveling can be achieved. That is, according to the present invention, the work process can be easily planned and the construction efficiency can be improved.

In addition, the pillar-beam main bar tip prefabricated hollow P created in the first step in the method of constructing a pillar according to the second aspect of the present invention.
The C-column unit is a column-beam main bar pre-assembly in which the first beam form is attached to the upper end of the side surface of the first hollow PC column form so as to cover the lower side of the first beam main bar pre-assembly rebar basket. Hollow P
Since the second hollow PC pillar formwork, which is a C pillar unit and is made in the first step, is the second hollow PC pillar formwork in which the second beam formwork is attached to the upper end portion of the side surface, It is not necessary to assemble the beam formwork in the vicinity of the hollow PC column formwork on the construction floor when simultaneously constructing the and beam, and the construction efficiency of the building can be further enhanced.

[0038] Further, the column beam main bar pre-assembled hollow P produced in the first step in the method of constructing a column of the invention according to claim 3
In the C pillar unit, a plurality of the first hollow PC pillar formwork are arranged side by side at a predetermined interval, and the first beam main reinforcing bar pre-assembled rebar cage is provided on an upper end portion of the plurality of first hollow PC pillar formwork. Since it is a pillar-beam main bar pre-assembled hollow PC pillar unit constructed by being erected, when one pillar beam main bar pre-assembled hollow PC pillar unit is erected on the construction floor, a plurality of first hollow PC pillar formwork is constructed. It is erected in parallel with the floor at the same time. Therefore, according to this invention, the construction efficiency of the building can be further improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a work procedure in a method of constructing a pillar according to the present invention.

FIG. 2 is an explanatory diagram of a work procedure following FIG.

FIG. 3 is a plan view of a column / column main reinforcement first PC column unit different from the column / beam main reinforcement first PC column unit in FIG. 1;

FIG. 4 is a plan view of a column-column main bar tip assembled PC column unit different from FIGS. 1 to 3;

FIG. 5 is a view showing a state in which a column-column main-bar pre-assembled PC column unit different from FIGS. 1 to 4 is lifted.

FIG. 6 is a column-column main bar pre-assembled PC column unit and second hollow P
It is a figure which shows an example of the array form of a C pillar formwork.

FIG. 7 is a sectional view taken along the line AA in FIG.

FIG. 8 is a sectional view taken along the line BB in FIG.

9 is a sectional view taken along the line CC in FIG.

10 is a sectional view taken along the line DD in FIG.

FIG. 11 is a view showing an arrangement form of a post-column main bar pre-assembled PC post unit and a second hollow PC post form different from those in FIG. 6;

FIG. 12 is an explanatory view of a method of constructing a column using a conventional hollow PC column formwork.

FIG. 13 is an explanatory diagram of a method of constructing a column using a conventional column / beam main reinforcement tip assembled hollow PC column unit.

[Explanation of symbols]

21,41,45,51 ... PC beam unit with pillar beam main bars
22, 42, 48 ... First hollow PC column formwork, 23, 43, 4
4,46,47,54,55 ... 1st beam main reinforcement point assembly braces, 24
… Leading pillar main bars, 27… Long pillar main bars, 28
… Short pillar main bar, 36… Second hollow PC column formwork, 37… Second beam main bar front assembled rebar cage, 38… Beam formwork

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-239884 (JP, A) JP-A-62-55377 (JP, A) JP-A-7-18785 (JP, A) JP-A-3- 233059 (JP, A) JP-A-1-226982 (JP, A) JP-A-4-272344 (JP, A) JP-A-6-158712 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04G 21/12 105 E04C 3/34 E04B 1/38-1/60

Claims (3)

(57) [Claims] 1. A first hollow precast concrete column formwork forming a tubular body of a reinforced concrete structure in which column shear reinforcements are embedded, and a first beam placed on the upper end of the first hollow precast concrete column formwork. The first beam main rebar cage is preassembled in a predetermined arrangement with the main bar front rebar cage and penetrates through the first beam main bar front rebar cage to be inserted into the first hollow precast concrete column formwork over the entire length thereof . Gumi Reinforcement Basket and 1st
A hollow precast concrete column formwork and a plurality of pre-assembled column main bars having a floor height of two floors inserted to be movable relative to each other are used to create a column beam main bar pre-assembled hollow precast concrete column unit, and 1 a first step to have created a second hollow precast concrete pillar formwork forming the same configuration as the hollow precast concrete pillar formwork travels lifting the beam-column longitudinal reinforcement destination sets hollow precast concrete column unit, the first After connecting the lower end part of the above-mentioned pre-assembled column main bar penetrating the hollow precast concrete column formwork to the upper end part of the first column main bar projecting from the construction floor surface by a predetermined column bar connection length, A second step in which the hollow precast concrete column formwork is lowered together with the first beam main rebar tip assembly rebar cage and installed on the construction floor surface; and the second hollow precast The concrete pillar formwork is hoisted and moved, and it is installed on the floor of the construction floor by extrapolating it to the second pillar main bar that protrudes from the construction floor by the length obtained by adding the construction floor height to the column reinforcement connection length. The third step to perform, and concrete is placed in the above-mentioned column beam main bar pre-assembled hollow precast concrete column unit and the above-mentioned second hollow precast concrete column formwork, and the above-mentioned first and second hollow precast concrete column formwork and the above-mentioned construction It is provided with the 4th process which makes a floor and floor an integrated structure, and said 1st pillar main reinforcement and 2nd pillar main reinforcement are arranged alternately in at least one of the two girder directions of a building. How to build a characteristic pillar. 2. The method for constructing a column according to claim 1, wherein the column beam main bar pre-assembled hollow precast concrete column unit produced in the first step has an upper end on a side surface of the first hollow precast concrete column formwork. Is a hollow beam precast concrete pillar unit with a first beam main bar to which the first beam form is attached so as to cover the underside of the first beam main bar to the front rebar basket, and is formed in the first step. 2 Hollow precast concrete pillar formwork
A method for constructing a column, which is a second hollow precast concrete column formwork in which a second beam formwork is attached to an upper end portion of a side surface. 3. The method for constructing columns according to claim 1, wherein in the column beam main bar pre-assembled hollow precast concrete column unit created in the first step, the first hollow precast concrete column formwork is arranged at predetermined intervals. A pillar beam main bar pre-assembled hollow precast concrete pillar unit in which a plurality of the first beam main bar pre-assembled rebar cages are erected on the upper ends of the plurality of first hollow precast concrete pillar formwork while being arranged in parallel. A method of constructing a pillar characterized by that.